package com.ityu.cloudclientone.sentinel;

import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

/**
 * author: yu.jl
 * e-mail: bbfx89625@gmail.com
 * time  : 2021/6/25
 * desc  :
 */
@Component
public class CustomUrlBlockHandler implements BlockExceptionHandler {
    @Override
    public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception {
        System.out.println("CustomUrlBlockHandler-handle");
        String msg = "";
        if (e instanceof FlowException){
            msg = "被限流了";
        }else if (e instanceof DegradeException){
            msg = "被降级了";
        }else if (e instanceof ParamFlowException){
            msg = "热点参数限流";
        }else if (e instanceof SystemBlockException){
            msg = "系统规则（负载/...不满足规则）";
        }else if (e instanceof AuthorityException){
            msg = "授权规则不通过";
        }
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Type","application/json");
        response.setContentType("application/json;charset=utf-8");
        PrintWriter writer = response.getWriter();
        writer.print(msg);
        writer.flush();
        writer.close();
    }
}
